Secondary Battery Terminal Resin Penetration Prevention
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Solution Overview
Problem
Conventional secondary battery electrode terminals, composed of different materials bonded together, face issues with resin penetration during integration, leading to deformation and damage at the bonded zone, which prevents busbar welding and compromises the integrity of the bonded zone.
Innovation Solution
The integration of a projecting portion on the first member and a chamfered portion on the second member, which combine to block resin penetration, enhancing the structural rigidity of the first member and preventing damage to the bonded zone by increasing the cross-sectional area and ensuring effective insulation between the lid member and the electrode terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the lid member and electrode terminal are integrated with resin, then the integration between lid member and electrode terminal is improved, but the resin penetrates between the first member and second member causing deformation and damage to the bonded zone
Solution Approach 1:
The projecting portion is formed on the first member before the resin integration process. This preliminary structural feature creates a physical barrier that prevents resin from penetrating into the bonded zone between the first and second members, thereby protecting the bonded zone integrity while still allowing resin integration to occur.
Solution Approach 2:
The projecting portion acts as an intermediary structure between the first member and the resin. It provides a barrier that mediates the interaction between the resin and the bonded zone, allowing the resin to integrate with the electrode terminal outer surface while preventing it from penetrating into the sensitive bonded area.
2Strength
If the first member has increased cross-sectional area with projecting portion, then the rigidity of the first member is improved, but the device complexity increases
Solution Approach 1:
The projecting portion serves multiple functions simultaneously: it increases the cross-sectional area and rigidity of the first member, acts as a physical barrier to prevent resin penetration, and provides structural support for the overall electrode terminal assembly. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The electrode terminal is segmented into distinct functional zones: the first member with the projecting portion, the bonded zone, and the second member. This segmentation allows each part to be optimized for its specific function while maintaining overall structural integrity.
Data Source
AI summary
In a secondary battery, a lid member and a negative terminal are integrated through a resin. The negative terminal includes a first member and a second member. A first bonded surface of a lower surface of the first member is bonded to a second bonded surface of an upper surface of the second member. The first member includes a projecting portion at an outer peripheral edge of the lower surface of the first member. The second member includes a chamfered portion at an outer peripheral edge of the upper surface of the second member. The projecting portion and the chamfered portion are combined with each other so that the projecting portion contacts the chamfered portion.